RCA Compatible Color (NTSC System)

In late 1953, the FCC adopted the RCA compatible system. The first color
television sets for this system were sold in 1954. They used a 15
inch screen. Later that year, 19 inch sets were made, and by 1955 all
sets were made with a 21 inch picture tube. Several
manufacturers made 15 and 19 inch sets, most in very small quantities.